One of my favorite Disney movies is Mulan. Not just because she is so strong, personable, and smart, but because of the underlying message to the whole movie: Follow your heart!
When you follow your heart's wishes (within reason, of course), you will be able to set about anything with conviction and strength.
So, next time you are at a crossroads, after writing down all the logical reasons for each option, let your heart make the final decision. You'll be more likely to succeed. ;)
This ties in with my previous post about living the life you want.